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APPLICATION INFORMATION

PCA9545A

SD1

SDA

SCL

SDA

Channel 0

Channel 1

Channel 2

Channel 3

See Note A

Master

SCL

INT

RESET

INT1

SC1

SD2

SC2

SD3

SC3

INT2

INT3

SD0

INT0

SC0

See Note A

See Note A

See Note A

19

18

17

3

20

5

6

4

8

9

7

12

13

11

15

16

14

2

1

10

A1

A0

GND

PCA9545A

WITH INTERRUPT LOGIC AND RESET FUNCTIONS

SCPS147C – OCTOBER 2005 – REVISED OCTOBER 2006

Figure 13 shows an application in which the PCA9545A can be used.

A.

If the device generating the interrupt has an open-drain output structure or can be 3-stated, a pullup resistor is

required. If the device generating the interrupt has a totem-pole output structure and cannot be 3-stated, a pullup

resistor is not required. The interrupt inputs should not be left floating.

B.

Pin numbers shown are for DGV, DW, PW, and RGY packages.

Figure 13. Typical Application

16

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